HTML Embed Builder & Preview
Our HTML embed builder helps you create safe, privacy-friendly embed code for iframes, video, audio, images, and quotes. Includes sandboxing, lazy loading, responsive sizing, and YouTube no-cookie support.
- Embed Types
- 5 Types
- Sandboxing
- 12 Options
- Privacy
- No-Cookie
- Price
- Free
Sandbox Security
Configure iframe sandbox permissions for maximum security. Only enable permissions you need.
Lazy Loading
Built-in lazy loading for images and iframes to improve page load performance and Core Web Vitals.
Privacy Options
YouTube no-cookie support and referrer policy options to protect user privacy and comply with GDPR.
Build Your Embed
Choose embed type and configure security, privacy, and performance options
Iframe Settings
How It Works
Choose Embed Type
Select iframe, video, audio, image, or quote. Each type has specific attributes and security considerations.
Configure Security & Privacy
For iframes, set sandbox permissions (start minimal). Enable YouTube no-cookie for privacy. Set loading='lazy' for performance. Learn more about lazy loading best practices from Web.dev.
Set Responsive Sizing
Configure width, height, and responsive attributes. For images, use srcset and sizes. For iframes, use aspect-ratio CSS.
Why Use Our Embed Builder?
- ✓Security: Sandbox permissions for iframes prevent XSS attacks
- ✓Privacy: YouTube no-cookie support and referrer policy options
- ✓Performance: Lazy loading for faster page loads
- ✓Responsive: Built-in responsive sizing options
- ✓Accessibility: Proper alt text, titles, and ARIA labels
What Makes Safe HTML Embeds?
Safe HTML embeds protect your site and users from security vulnerabilities, privacy violations, and performance issues. They use proper sandboxing, privacy options, lazy loading, and responsive sizing. According to MDN Web Docs, iframe sandboxing is essential for preventing XSS attacks and protecting user data.
Key features include iframe sandboxing to prevent XSS attacks, YouTube no-cookie support for GDPR compliance, lazy loading to improve page performance, responsive sizing for mobile devices, and proper accessibility attributes. The W3C Content Security Policy guidelines recommend using sandbox attributes to restrict iframe capabilities and enhance security.
✗Unsafe Embed
- • No sandbox restrictions
- • YouTube with cookies
- • Eager loading everything
- • Fixed pixel dimensions
- • Missing accessibility attributes
✓Safe Embed
- • Sandbox permissions configured
- • YouTube no-cookie enabled
- • Lazy loading for performance
- • Responsive sizing
- • Full accessibility support
Frequently Asked Questions
How do I safely embed iframes with sandboxing?
Use the sandbox attribute with specific permissions like 'allow-scripts', 'allow-same-origin', and 'allow-forms'. Only enable permissions you actually need. Our tool includes all sandbox options and explains each one's security implications.
What's the difference between loading='lazy' and loading='eager'?
loading='lazy' defers loading until the element is near the viewport, improving initial page load. loading='eager' loads immediately. Use lazy for below-the-fold content, eager for critical above-the-fold images.
How do I embed YouTube videos without cookies?
Use youtube-nocookie.com instead of youtube.com in the embed URL. Our tool automatically converts YouTube URLs to the privacy-friendly version when you enable the 'YouTube No-Cookie' option.
What sandbox permissions should I use for iframes?
Start with minimal permissions: 'allow-same-origin' and 'allow-scripts' for basic functionality. Add 'allow-forms' if forms are needed, 'allow-popups' for popups. Never use all permissions unless absolutely necessary for security.
How do I make embedded content responsive?
For iframes, use CSS aspect-ratio or a wrapper div with padding-bottom trick. For images, use width='100%' with max-width constraints, or use srcset and sizes attributes. Our tool includes responsive sizing options.
What's the best way to optimize image embeds?
Use loading='lazy' for below-the-fold images, decoding='async' for non-critical images, srcset and sizes for responsive images, and proper alt text for accessibility. Our tool includes all these optimization options.
Should I use autoplay for video embeds?
Generally no. Autoplay can be annoying and wastes bandwidth. Most browsers block autoplay with sound. If you must use it, ensure videos are muted and include controls. Our tool lets you configure all video attributes.
What's the difference between <q>, <blockquote>, and <cite>?
<q> is for short inline quotes. <blockquote> is for longer block quotes, often with a <cite> for attribution. <cite> marks the source title. Our tool generates semantic quote markup with proper citations.